JPH0681955A - Metal gasket - Google Patents

Abstract

PURPOSE:To facilitate attachment of a metal gasket to an object by a method wherein the bolt insertion part of one edge part of a metal gasket in which a plurality of bolt insertion parts are formed along an edge part forms a circular hole, and the bolt insertion part of the other edge part forms a notch. CONSTITUTION:A metal gasket 15 located between the cylinder head of a four- cylinder engine and an exhaust gas manifold is formed such that four stainless steel sheets are superposed with each other and coupled with each other by means of rivets 16. A bolt insertion part 21 is formed in each of upper and lower edge parts 18 and 19 of a metal head 15 and by fastening a stud bolt 4 inserted in each insertion part 21, the metal gasket 15 is nipped between the cylinder head and the exhaust gas manifold. In this case, the bolt insertion part 21 positioned at an intermediate part between the right and the left of the upper edge part 18 of the metal gasket 15 forms a circular hole 22 and meanwhile, the other bolt insertion parts 23 and 24 form notches 23 and 24, and mounting of the metal gasket 15 is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket provided between an engine cylinder head and an exhaust pipe, for example.

[0002]

2. Description of the Related Art Conventionally, some engines are constructed as follows. That is, an exhaust port is formed in the cylinder head, and a plurality of stud bolts are provided so as to project at the opening edge of the exhaust port. The exhaust pipe is screwed to the cylinder head by these stud bolts, and the exhaust passage in the exhaust pipe communicates with the exhaust port. In addition, a metal gasket is provided between the cylinder head and the exhaust pipe to seal them. In this case, a plurality of bolt insertion portions are formed on the edge portion of the metal gasket, and all the bolt insertion portions are circular holes. Then, the stud bolt is inserted through these circular holes, and a metal gasket is attached between the cylinder head and the exhaust pipe.

[0003]

By the way, when assembling the metal gasket to the cylinder head,
First, the circular hole of the metal gasket is fitted to the protruding end of the stud bolt. The metal gasket has rigidity, and the diameter of the circular hole is set to ensure the assembly accuracy of the metal gasket. The dimensions are only slightly larger than the stud bolts. For this reason,
When some of the circular holes are fitted to the protruding ends of the stud bolts, if the metal gasket inclines even slightly with respect to the vertical direction of each stud bolt, the other part of the circular hole becomes the stud bolt. Difficult to fit. Therefore, the conventional metal gasket has a problem that it is difficult to assemble it.

[0004]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned circumstances, and when a metal gasket having a plurality of bolt insertion portions formed along an edge is attached to an object, the attachment can be easily performed. The purpose is to be able to.

[0005]

A feature of the present invention for achieving the above-mentioned object is a metal gasket having a plurality of bolt insertion portions formed along an edge portion, and one end edge of the metal gasket is provided. The bolt insertion portion in the portion is a circular hole, and the bolt insertion portion at the other end edge portion on the side opposite to the one end edge portion is a notch.

[0006]

[Operation] The operation of the above configuration is as follows. The terms in parentheses below correspond to the terms in the claims. The bolt insertion portion 21 in the upper edge portion (one end edge portion) 18 of the metal gasket 15 is formed into the circular hole 2
2, and the bolt insertion portion 21 in the lower edge portion (the other end edge portion) 19 on the side opposite to the upper edge portion (the one end edge portion) 18 is provided as a notch 24. The metal gasket 15 having the above structure
When the circular hole 22 and the notch 24 are to be fitted to the projecting end of the stud bolt 4 projecting from the object, the circular hole 22 is first formed in the above-mentioned manner. The upper bolt 5, which is a part of the stud bolt 4, is fitted.

At this time, as shown by phantom lines in FIG. 3, even if the metal gasket 15 is inclined with respect to the vertical direction of the upper bolt 5 which is a part of each stud bolt 4, it is the other part of the stud bolt 4. For the protruding end of the lower bolt 6,
The notch 24 fits smoothly without any trouble. Therefore, the circular hole 22 and the notch 24 can be easily fitted into each stud bolt 4. In the above case, if the diameter of the circular hole 22 is made slightly larger than that of the upper bolt 5 of the stud bolt 4, the assembling accuracy of the metal gasket 15 can be sufficiently improved. Even in this case, The metal gasket 15 can be easily attached by the above-described attachment work.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 is a parallel 4 mounted on an automobile.
The arrow Fr indicates the front of the cylinder engine. 1 and 2, the cylinder head 2 of the engine 1 described above
An exhaust port 3 is formed in each cylinder. A plurality of stud bolts 4 are provided so as to surround these exhaust ports 3, and each stud bolt 4 is provided so as to project forward.

The stud bolts 4 have the same shape and the same size, and these stud bolts 4 are four upper bolts 5 linearly arranged on the left and right above the exhaust port 3.
And four lower bolts 6 linearly arranged on the left and right sides below the exhaust port 3. An exhaust manifold 8 is screwed to the cylinder head 2 by the stud bolt 4 and a nut 7 screwed to the stud bolt 4. An exhaust passage 9 in the exhaust manifold 8 communicates with the exhaust port 3.

A turbocharger 11 is attached to the downstream end of the exhaust manifold 8, and the exhaust 12 of the engine 1 is sent to the turbocharger 11 through the exhaust port 3 and the exhaust passage 9. Reference numeral 13 is an outlet of the exhaust 12. The turbocharger 11 is also supported on the engine 1 side by the bracket 14 and the bolt 14a.

A metal gasket 15 is provided between the cylinder head 2 and the exhaust manifold 8 to seal them. This metal gasket 15
Is formed by stacking four stainless steel plates and connecting them with a rivet 16. Further, four communication holes 17 on the left and right are formed in the upper and lower middle portions of the metal gasket 15, and these communication holes 17 connect the exhaust port 3 and the exhaust passage 9 to each other.

The upper and lower edges 1 of the metal gasket 15
A bolt insertion portion 21 is formed in each of 8 and 19, and the stud bolt 4 is inserted into the bolt insertion portion 21, and a metal gasket 15 is attached between the cylinder head 2 and the exhaust manifold 8.

The bolt insertion portion 21 is composed of a circular hole 22 and notches 23 and 24. The circular hole 22 is located at the left-right intermediate portion of the upper edge portion 18 which is one end edge portion of the metal gasket 15. On the other hand, the notches 23 are located at the left and right ends of the upper edge portion 18 of the above, and these are open upward. Further, the notch 24 is formed in the lower edge portion 19 which is the other edge portion on the side opposite to the upper edge portion 18, and these are open downward. The exhaust port 3, the stud bolt 4, and the metal gasket 15 are bilaterally symmetrical with respect to the virtual center line 25 in FIG.

In order to attach the metal gasket 15 having the above structure to an object, a circular hole 22 and a notch 23 are formed in the protruding end of the stud bolt 4 projecting from the object.
When trying to fit with 24, first, the circular hole 2
2 and the notch 23 are fitted to the upper bolt 5, which is a part of the stud bolt 4.

At this time, as shown by the phantom line in FIG. 3, even if the metal gasket 15 is tilted in the vertical direction with respect to the axis of the upper bolt 5 which is a part of each of the stud bolts 4, the other stud bolts The notch 24 fits smoothly into the projecting end of the lower bolt 6 as a part without any trouble. Therefore, the circular hole 22 and the notches 23 and 24 can be easily fitted into the stud bolts 4.

In the above case, the diameter of the circular hole 22 is made slightly larger than that of the upper bolt 5 of the stud bolt 4, so that the assembling accuracy of the metal gasket 15 is sufficiently improved. Even in such a case, the metal gasket 15 can be easily attached by the above-mentioned attaching work.

The notch 23 may have a shape that opens toward the left and right outer sides as shown by the phantom line in FIG. With this configuration, even when the metal gasket 15 is tilted in the left-right direction with respect to the axis of the stud bolt 4 in a plan view with the circular hole 22 fitted in the upper bolt 5,
The notches 23 are smoothly fitted to the upper bolts 5 at the left and right ends without any trouble, and the metal gasket 15 can be attached more easily. Further, in the above configuration, the circular hole 22 and the notch 24 may be provided upside down, or may be distributed to the left and right edge portions.

In FIG. 2, a heat shield cover plate 27 made of a metal plate is provided to cover the exhaust manifold 8 and the turbocharger 11 from the front side. This heat shield cover plate 27
The upper part of the same is detachably screwed to the exhaust manifold 8 by a pair of left and right upper bolts 28, and the lower part of the heat shield cover plate 27 is detachably screwed to the turbocharger 11 by a single lower bolt 29. There is. The heat shield cover plate 27 prevents the heat of the exhaust 12 from adversely affecting other components.

A louver 30 is formed on the front surface of the heat shield cover plate 27. Then, the traveling wind 31 passes through the louver 30 and enters the heat shield cover plate 27, whereby the exhaust manifold 8 and the turbocharger 11 are discharged.
Is cooled by air.

[0020]

According to the present invention, the bolt insertion portion at one end edge portion of the metal gasket is a circular hole, and the bolt insertion portion at the other end edge portion on the side opposite to the one end edge portion is notched. When a metal gasket is fitted to a protruding end of a stud bolt protruding from an object and a circular hole is fitted to a part of the stud bolt, the metal gasket tilts with respect to the vertical direction of the stud bolt. Even in this case, the notch can be smoothly fitted into the protruding end of the other portion of the stud bolt without any trouble. Therefore, the circular hole and the notch can be easily fitted to each stud bolt, that is, the metal gasket can be easily attached to the object. In the above case, if the diameter of the circular hole is made slightly larger than the stud bolt, the assembly accuracy of the metal gasket can be sufficiently improved. The metal gasket can be installed easily.

[Brief description of drawings]

FIG. 1 is a view taken along the line 1-1 of FIG.

FIG. 2 is a partial side sectional view of the engine.

FIG. 3 is an operation explanatory view taken along a line 3-3 of FIG.

[Explanation of symbols]

 2 Cylinder Head 4 Stud Bolt 5 Upper Bolt 6 Lower Bolt 8 Exhaust Manifold 15 Metal Gasket 18 Upper Edge (One Edge) 19 Lower Edge (Other Edge) 21 Bolt Insertion 22 Circular Hole 24 Notch

Claims (1)

[Claims] 1. A metal gasket in which a plurality of bolt insertion portions are formed along an edge portion, wherein the bolt insertion portion at one end edge portion of the metal gasket is a circular hole, and the other end opposite to the one end edge portion is formed. A metal gasket with a notch in the bolt insertion part at the edge.